That appears to be an artifact of whatever synthesizer you are using.  I hear it spoken correctly with Eloquence and E-Speak.

Gene

This has been driving me insane for a while, but I've chosen to ignore it up until now.

Any time NVDA hits a case where there is "no next" something, like during object navigation or screen review, it has always said something that's much more akin to "non ext."

I have to believe that this is because, somewhere, the actual two word text phrase, "No Next," is in the bowels of NVDA somewhere, hopefully in settings, entered as a single word, "nonext."

When there is not a next of thing X, I want to hear, "No Next thing X," not, "non ext thing X."
--

Brian - Windows 10, 64-Bit, Version 21H2, Build 19044  

The real art of conversation is not only to say the right thing in the right place but to leave unsaid the wrong thing at the tempting moment.

        ~ Dorothy Nevill